Documentation

The envelope from address. If not specified, takes the system's default, which is usually based on the effective userid of the current process. This is not necessarily what you want, so I recommend specifying it.

This function takes a message, a list of recipients, and an optional sender,
and transmits it using the system's MTA, sendmail.

If sendmail is on the PATH, it will be used; otherwise, a list of system
default locations will be searched.

A failure will be logged, since this function uses safeSystem
internally.

This function will first try sendmail. If it does not exist, an error is
logged under System.Cmd.Utils.pOpen3 and various default sendmail locations
are tried. If that still fails, an error is logged and an exception raised.